public function getChapterregion($con = null)
 {
     include_once 'lib/model/om/BaseChapterregionPeer.php';
     if ($this->aChapterregion === null && $this->chapterregion_id !== null) {
         $this->aChapterregion = ChapterregionPeer::retrieveByPK($this->chapterregion_id, $con);
     }
     return $this->aChapterregion;
 }